'''
    实现图片转字符画类I2Char中genCharImage方法pass占位的代码，该方法将图片转化成字符画 
'''
from PIL import Image

IMG = '/Users/yanghongyi/Desktop/1.png'

WIDTH = 60
HEIGHT = 45

ascii_char = list("$@B%8&WM#*oahkbdp768qwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ")


# 将256灰度映射到70个字符上
def get_char(r, g, b, alpha=256):
    if alpha == 0:
        return ' '
    length = len(ascii_char)
    gray = int(0.2126 * r + 0.7152 * g + 0.0722 * b)  # 计算灰度
    unit = (256.0 + 1) / length
    return ascii_char[int(gray / unit)]  # 不同的灰度对应着不同的字符
    # 通过灰度来区分色块


if __name__ == '__main__':
    im = Image.open(IMG)
    im = im.resize((WIDTH, HEIGHT), Image.NEAREST)
    txt = ""
    for i in range(HEIGHT):
        for j in range(WIDTH):
            txt += get_char(*im.getpixel((j, i)))
        txt += '\n'

    print(txt)
    # 写入文件
    with open("output.txt", 'w') as f:
        f.write(txt)
